// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "content/browser/background_sync/background_sync_network_observer.h"

#include "base/location.h"
#include "base/single_thread_task_runner.h"
#include "base/threading/thread_task_runner_handle.h"
#include "content/public/browser/browser_thread.h"

namespace content {

// static
bool BackgroundSyncNetworkObserver::ignore_network_change_notifier_ = false;

// static
void BackgroundSyncNetworkObserver::SetIgnoreNetworkChangeNotifierForTests(
    bool ignore)
{
    ignore_network_change_notifier_ = ignore;
}

BackgroundSyncNetworkObserver::BackgroundSyncNetworkObserver(
    const base::Closure& network_changed_callback)
    : connection_type_(net::NetworkChangeNotifier::GetConnectionType())
    , network_changed_callback_(network_changed_callback)
{
    DCHECK_CURRENTLY_ON(BrowserThread::IO);

    net::NetworkChangeNotifier::AddNetworkChangeObserver(this);
}

BackgroundSyncNetworkObserver::~BackgroundSyncNetworkObserver()
{
    DCHECK_CURRENTLY_ON(BrowserThread::IO);

    net::NetworkChangeNotifier::RemoveNetworkChangeObserver(this);
}

bool BackgroundSyncNetworkObserver::NetworkSufficient(
    SyncNetworkState network_state)
{
    DCHECK_CURRENTLY_ON(BrowserThread::IO);

    switch (network_state) {
    case NETWORK_STATE_ANY:
        return true;
    case NETWORK_STATE_AVOID_CELLULAR:
        // Note that this returns true for CONNECTION_UNKNOWN to avoid never
        // firing.
        return connection_type_ != net::NetworkChangeNotifier::CONNECTION_NONE && !net::NetworkChangeNotifier::IsConnectionCellular(connection_type_);
    case NETWORK_STATE_ONLINE:
        return connection_type_ != net::NetworkChangeNotifier::CONNECTION_NONE;
    }

    NOTREACHED();
    return false;
}

void BackgroundSyncNetworkObserver::OnNetworkChanged(
    net::NetworkChangeNotifier::ConnectionType connection_type)
{
    DCHECK_CURRENTLY_ON(BrowserThread::IO);

    if (ignore_network_change_notifier_)
        return;
    NotifyManagerIfNetworkChanged(connection_type);
}

void BackgroundSyncNetworkObserver::NotifyManagerIfNetworkChangedForTesting(
    net::NetworkChangeNotifier::ConnectionType connection_type)
{
    NotifyManagerIfNetworkChanged(connection_type);
}

void BackgroundSyncNetworkObserver::NotifyManagerIfNetworkChanged(
    net::NetworkChangeNotifier::ConnectionType connection_type)
{
    DCHECK_CURRENTLY_ON(BrowserThread::IO);
    if (connection_type == connection_type_)
        return;

    connection_type_ = connection_type;
    NotifyNetworkChanged();
}

void BackgroundSyncNetworkObserver::NotifyNetworkChanged()
{
    DCHECK_CURRENTLY_ON(BrowserThread::IO);

    base::ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE,
        network_changed_callback_);
}

} // namespace content
